versions.json5

{//first meta file
  metaVersion: [
    1,
    0
  ],
  releaseCandidates: [
    {
      version: "5.6.0-beta.4",
      //the same as version's version obj, normally hidden in file chooser
    },
    //...
  ],
  releases: [
    {
      version: "5.0.0",
      url: "aij./com/specific/version.json",
      minJava: 21,
      maxJava: 24,
    }
  ],
}

//specific version file
{
  version: "5.5.0",//todo support x.y.z.n, implicit n=0
  files: [
    {
      fileName: "ij.jar",
      url: "github.com/blah",
      destination: "libs",//location to put downloaded file todo verify location on download is with AIJ app
      hash: "safhuiaqyq",//maybe, for verifying download success
      signing: "sdugfy98",//maybe later
      os: "windows"//todo maybe, possibly an array or if unspecified do it for all
    }
  ],
  launchArgs: [
    {
      os: "all",//todo if not specified, apply to all
      args: [
        "--enable-native-access=ALL-UNNAMED"
      ]
    },
    {
      os: "mac",
      args: [
        "--some-mac-arg"
      ]
    }
  ],
  message: "..."//message to show on update
}